She will wake up and deny the whole situation, which is typical.
Hopefully it won't drag on for many chapters and she will accept the reality she is in.
I don't think this revelation will change much in their relationship... I doubt she knew of her mother's deeds, even if she did it happened when she was a little girl.
Our female lead is the embodiment of kindness and cruelty in one body. She will smite any and all fool who dares cross her, be it a person, clan or country. But she will show kindness and benevolence to those she deems as allies, friends and family.
Nu hu! Hell no! This story better have a damn good side story to justify this hell made persons behavior and a damn well arc to redeem him.
This time I am rooting for death for the male lead.